Procoding seems not to work anymore under Yosemite.
When I’m editing Processing sketches the edits will not be executed. It looks like the originally opened sketch is still being executed without taking into account the modifications.

It seems that the first few changes are accepted and then something goes wrong. This might be due to a change in Webkit’s caching behavior, though I’m a bit stumped to see that it seems to work fine for JavaScript sketches.

– there’s only processing.js affected, that’s the reason I didn’t notice it yet
– Yosemite changed the way WebViews are caching. In all other libraries that load scripts, I am appending the current date/time, to prevent caching. Processing.js however loads local files with an xhr (AJAX request), which might be cool and nerdy stuff, but it’s the main reason things are so broken, e.g. no local previews for processing.js in Chrome and Firefox.

The good news is: I found a workaround.
The bad news is: it might violate the AppStore guidelines, so I don’t know if it’ll get accepted.